Hi Pim,
Thank you for contacting Syncfusion Support.
Before the release of 14.2.0.32 version, the PropertyGrid does not have support to resize the Column of PropertyGrid. In 14.2.0.32 release, we have implemented the feature to show the content present in the Property Columns by enabling the resizing support for Column of PropertyGrid. Also you can use this feature in our Getting Started sample. Please find the screenshot for the same.
Screenshot:
Regards
Vijayalakshmi V.R.